NGC 7469

NGC 7469
NGC 7469 (lower left) and IC 5283 (upper right) by Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationPegasus
Right ascension23h 03m 15.6s[1]
Declination+08° 42′ 26″[1]
Redshift0.016317 ± 0.000007 [1]
Heliocentric radial velocity4,892 ± 2 km/s[1]
Distance195 ± 65.6 Mly (60.0 ± 20.1 Mpc)[1]
Apparent magnitude (V)12.3
Characteristics
Type(R')SAB(rs)a [1]
Apparent size (V)1.5′ × 1.1′[1]
Notable featuresSeyfert galaxy
Other designations
UGC 12332, Arp 298, Mrk 1514, MCG +01-58-025, PGC 70348[1]

NGC 7469 is an intermediate spiral galaxy in the constellation of Pegasus. NGC 7469 is located about 200 million light-years away from Earth, which means, given its apparent dimensions, that NGC 7469 is approximately 90,000 light-years across. It was discovered by William Herschel on November 12, 1784.[2]

NGC 7469 is a type I Seyfert galaxy, characterised by its bright nucleus. It is also a luminous infrared source with a powerful starburst embedded into its circumnuclear region.[3] The coexistence of a circumnuclear starburst ring and an active galactic nucleus have turned NGC 7469 into a key target for studying their relation.[4] NGC 7469 interacts with its smaller companion IC 5283, forming a pair collectively known in the Atlas of Peculiar Galaxies as Arp 298. NGC 7469 is one of the first galaxies observed by the James Webb Space Telescope.[5]

Characteristics

Active galactic nucleus

NGC 7469 as imaged by the James Webb Space Telescope. The bright nucleus has caused a diffraction spike that looks like a six-pointed star.

NGC 7469 is a type 1.2 Seyfert galaxy and one of the most well studied Seyfert galaxies. In 1943, this galaxy was one of six nebulae listed by American astronomer Carl K. Seyfert that showed broad emission lines in their nuclei.[6] Members of this class of objects became known as Seyfert galaxies, and they were noted to have a higher than normal surface brightness in their nuclei. NGC 7469 was also noted to have very broad hydrogen lines.[7] Type 1 Seyfert galaxies are identified as having broad emission lines and being radio-quiet active galactic nuclei (AGN) in the unified scheme suggested in the 1990s.[8][9]

The most accepted theory for the energy source of AGNs is the presence of an accretion disk around a supermassive black hole. In the case of NGC 7469 the mass of the circumnuclear gas disk is nearly equal to that of the accretion disk.[10] NGC 7469 is believed to host a supermassive black hole whose mass is estimated to be (12.2±1.4)×106 M☉ based on broad emission-line reverberation mapping[11] or 6460000 M☉ as measured based on velocity dispersion.[12] Around the black hole there is a dust torus lying at a distance of 65-87 light days, based on K-band lag times.[13]

The light curves of NGC 7469 feature variability, a phenomenon common among Seyfert galaxies, with significant variability along its spectrum. Various studies have monitored its X-ray, UV and optical spectrum for several months. A more long-term study of the variability was published in 2017, after monitoring the optical spectrum of NGC 7469 from 1996 to 2015. Maximum activity was observed in 1998, while several flare-likes events lasting 1–5 days took also place. The variability of the spectrum seems to have two periods of around 1200 and 2600 days. There were also observed time-lags, which were nearly 21 days for Hβ, 3 days for Ha, and 3 days for HeII.[14]

It has been observed in the X-ray and ultraviolet that there is an outflow of ionised gas from the region of the nucleus. The total output of the outflow is estimated to be 0.06 M☉ per year. Based on the spectrum of the outflow, it is composed of two elements, one with a velocity of 580–720 km/s and high ionisation and one with a velocity of 2300 km/s and lower ionisation. The location of the faster gas is from the space between the supermassive black hole and the inner part of the torus and it may be wind produced from the torus.[15][16] The low velocity gas is a highly ionized, high-density absorber, located near the broad emission-line region. Its total column density is calculated to be 1020 per square centimetre.[17]

Genzel et al. detected a 1.5 arcsecond ridge of blueshifted, radially streaming gas emanating southward from the nucleus, that can also be spotted in radio waves. It could be gas outflowing from the nucleus or material channeled from the ring to the nucleus.[18] A small radio cone was also observed by Lonsdale et al.. They observed three spatially close sources in the nucleus, that may be explained as the nucleus with two radio jets in both sides emerging from the mid infrared disk.[19][20]

Starburst ring

The circumnuclear starburst ring by Hubble Space Telescope.

Around the nucleus has been observed a ring of intense star formation. Its emission was first detected in radio waves by Ulvestad et al. in 1981[21] and has then been observed in infrared, and optical wavelengths.[22] The ring accounts for up to two-thirds of the galaxy's bolometric luminosity (3×1011 L☉). The ring has a radius of 1".5 from the nucleus (500 pc).[18] The intense star formation in NGC 7469 may be a result of the interaction with IC 5283 and the presence of a small bar, however it is caused by local gravitational instabilities and not non-circular motions.[23] The star formation rate in the galaxy is estimated to be between 40 and 80 M☉/year.[24]

The ring was observed in great detail by the Hubble Space Telescope. About 30 star clusters were observed, with masses ranging from 0.5 to over 10 million M☉, fitting the definition of super star clusters. Such massive star clusters have been observed in other starburst and luminous infrared galaxies too. Further examination of the properties of the clusters revealed they group in two populations, a population of intermediate age (~9–20 Myr) and less obscured (AV ≈ 1 mag) star clusters, accounting for the 75% of the total population, and a population of young (1–3 Myr) and extinct (AV ≈ 3 mag) star clusters. The young stars account for about the one other of the mass of the ring and most of the infrared luminosity. Their location is marked by mid infrared and radio waves peaks, with the two brightest coinciding spatially with the ends of the nuclear molecular gas bar. The total stellar mass of the ring was estimated not to exceed 3.5 × 109 M☉.[22]

Other characteristics

Observations in the millimetre wavelengths produced a CO 2-1 map, which featured a partial ring or spiral arms at a radius of 1."5–2."5 (500-800 parsec at the distance of NGC 7469), with a bar-like structure connecting them to the central source. In the centre of the galaxy has been resolved in the 2.3 μm C0 2-0 band a nuclear star cluster, which measures 0."15-0."25 across. It has asymmetric shape and its age is less than 60 million years. It accounts for 20%–30% of the nuclear K-band light and about 10% of the nuclear bolometric luminosity.[4]

Aside the circumnuclear starburst ring, NGC 7469 features an inner spiral structure, about 33 arcseconds in diameter and a fainter outer ring, with a diameter of approximately 100 arcseconds.[7] In Hα imaging, a number of star producing H II regions have been observed in the north arm of NGC 7469 but none at the south one, most likely due to the interaction with IC 5283.[25]

Supernovae

Two supernovae have been detected in NGC 7469: SN 2000ft, and SN 2008ec (Type Ia, mag. 17.6).[26] SN 2000ft is the first radio supernova detected in the circumnuclear starburst of a luminous infrared Seyfert 1 galaxy, about 600 parsecs from its nucleus. Its evolution features characteristics of radio supernovae identified as type II supernovae.[27] A visual counterpart was detected in images by the Hubble Space Telescope taken on May 13, 2000, at visual magnitude 19.2.[28] Based on the rate of starburst activity in NGC 7469 it has been calculated that the core collapse supernova rate should be 0.8 supernova per year. However, observations of the circumnuclear ring of the galaxy in radiowaves failed to observe another radio supernova between 1998 and 2006, other than SN 2000ft. A possible reason is that most core collapse supernovae are radio quiet and cannot be detected against the galactic background emission (SN 2000ft had strong radio waves emission).[24]

Nearby galaxies

NGC 7469 forms a pair with its smaller companion IC 5283, a spiral galaxy with no nuclear activity 1'4 away. The tidal interaction between the two galaxies has created a prominent tail to the northeast and enhanced star formation on the eastern side as seen with Hα imaging of IC 5283 and is likely the cause of the star formation in NGC 7469.[25] A gas bridge has been detected between the two galaxies in HI imaging and there is evidence that NGC 7469 is drawing gas from the disk of IC 5283.[29] The galaxy pair is isolated.[30]

It has been suggested that the pair is an outlying member of the Pegasus I galaxy cluster,[31] whose most prominent members are the elliptical galaxies NGC 7619, and NGC 7626.[32] However, based on redshift, they belong to a galaxy group lying behind the cluster. Other members of this group include the disk galaxies NGC 7511, NGC 7515, NGC 7529, NGC 7535, NGC 7536, NGC 7570, NGC 7580, and NGC 7591. The group may be associated with the Perseus–Pisces Supercluster.[33]

References

  1. ^ a b c d e f g h "NASA/IPAC Extragalactic Database". Results for NGC 7469. Retrieved 2017-04-18.
  2. ^ Seligman, Courtney. "NGC 7469 (= PGC 70348; and with IC 5283 = Arp 298)". Celestial Atlas. Retrieved 19 November 2018.
  3. ^ "NGC 7469". www.spacetelescope.org. 24 April 2008.
  4. ^ a b Davies, R. I.; Tacconi, L. J.; Genzel, R. (10 February 2004). "The Nuclear Gasdynamics and Star Formation of NGC 7469". The Astrophysical Journal. 602 (1): 148–161. arXiv:astro-ph/0310681. Bibcode:2004ApJ...602..148D. doi:10.1086/380995. S2CID 43881394.
  5. ^ "NASA/IPAC Extragalactic Database". Hubble Peers at Peculiar Pair of Galaxies. 24 February 2022. Retrieved 2022-02-27.
  6. ^ Seyfert, Carl K. (January 1943), "Nuclear Emission in Spiral Nebulae", Astrophysical Journal, 97: 28, Bibcode:1943ApJ....97...28S, doi:10.1086/144488. See footnote 2.
  7. ^ a b Burbidge, E. Margaret; Burbidge, G. R.; Prendergast, K. H. (May 1963), "The Rotation and Physical Conditions in the Seyfert Galaxy NGC 7469", Astrophysical Journal, 137: 1022, Bibcode:1963ApJ...137.1022B, doi:10.1086/147580.
  8. ^ Antonucci, Robert (September 1993). "Unified Models for Active Galactic Nuclei and Quasars". Annual Review of Astronomy and Astrophysics. 31 (1): 473–521. Bibcode:1993ARA&A..31..473A. doi:10.1146/annurev.aa.31.090193.002353.
  9. ^ Urry, C. Megan; Padovani, Paolo (September 1995). "Unified Schemes for Radio-Loud Active Galactic Nuclei". Publications of the Astronomical Society of the Pacific. 107: 803. arXiv:astro-ph/9506063. Bibcode:1995PASP..107..803U. doi:10.1086/133630. S2CID 17198955.
  10. ^ Izumi, Takuma; Kawakatu, Nozomu; Kohno, Kotaro (10 August 2016). "Do Circumnuclear Dense Gas Disks Drive Mass Accretion Onto Supermassive Black Holes?". The Astrophysical Journal. 827 (1): 81. arXiv:1606.04115. Bibcode:2016ApJ...827...81I. doi:10.3847/0004-637X/827/1/81. S2CID 102342484.
  11. ^ Peterson, Bradley M. (2013). "Measuring the Masses of Supermassive Black Holes" (PDF). Space Science Reviews. 183 (1–4): 253. Bibcode:2014SSRv..183..253P. doi:10.1007/s11214-013-9987-4. S2CID 16464532. Archived from the original (PDF) on 2019-07-26. Retrieved 2018-12-06.
  12. ^ Nelson, Charles H. (2000). "Black Hole Mass, Velocity Dispersion, and the Radio Source in Active Galactic Nuclei". The Astrophysical Journal. 544 (2): L91–L94. arXiv:astro-ph/0009188. Bibcode:2000ApJ...544L..91N. doi:10.1086/317314. S2CID 117449813.
  13. ^ Suganuma, Masahiro; Yoshii, Yuzuru; Kobayashi, Yukiyasu; Minezaki, Takeo; Enya, Keigo; Tomita, Hiroyuki; Aoki, Tsutomu; Koshida, Shintaro; Peterson, Bruce A. (March 2006). "Reverberation Measurements of the Inner Radius of the Dust Torus in Nearby Seyfert 1 Galaxies". The Astrophysical Journal. 639 (1): 46–63. arXiv:astro-ph/0511697. Bibcode:2006ApJ...639...46S. doi:10.1086/499326. S2CID 7671684.
  14. ^ Shapovalova, Alla I.; Popović, L. Č.; Chavushyan, V. H.; Afanasiev, V. L.; Ilić, D.; Kovačević, A.; Burenkov, A. N.; Kollatschny, W.; Spiridonova, O.; Valdes, J. R.; Bochkarev, N. G.; Patino-Alvarez, V.; Carrasco, L.; Zhdanova, V. E. (7 January 2017). "Long-term optical spectral monitoring of NGC 7469". Monthly Notices of the Royal Astronomical Society. 466 (4): 4759–4775. arXiv:1701.01490. Bibcode:2017MNRAS.466.4759S. doi:10.1093/mnras/stx025. S2CID 119190376.
  15. ^ Blustin, A. J.; Kriss, G. A.; Holczer, T.; Behar, E.; Kaastra, J. S.; Page, M. J.; Kaspi, S.; Branduardi-Raymont, G.; Steenbrugge, K. C. (20 February 2007). "The mass-energy budget of the ionised outflow in NGC 7469". Astronomy & Astrophysics. 466 (1): 107–118. arXiv:astro-ph/0702311. Bibcode:2007A&A...466..107B. doi:10.1051/0004-6361:20066883. S2CID 16121393.
  16. ^ Mehdipour, M.; Kaastra, J. S.; Costantini, E.; Behar, E.; Kriss, G. A.; Bianchi, S.; Branduardi-Raymont, G.; Cappi, M.; Ebrero, J.; Di Gesu, L.; Kaspi, S.; Mao, J.; De Marco, B.; Middei, R.; Peretz, U.; Petrucci, P.-O.; Ponti, G.; Ursini, F. (17 July 2018). "Multi-wavelength campaign on NGC 7469". Astronomy & Astrophysics. 615: A72. arXiv:1803.08525. doi:10.1051/0004-6361/201832604. S2CID 119186659.
  17. ^ Scott, Jennifer E.; Kriss, Gerard A.; Lee, Julia C.; Quijano, Jessica Kim; Brotherton, Michael; Canizares, Claude R.; Green, Richard F.; Hutchings, John; Kaiser, Mary Elizabeth; Marshall, Herman; Oegerle, William; Ogle, Patrick; Zheng, Wei (20 November 2005). "Intrinsic Absorption in the Spectrum of NGC 7469: Simultaneous Chandra, FUSE, and STIS Observations". The Astrophysical Journal. 634 (1): 193–209. arXiv:astro-ph/0509349. Bibcode:2005ApJ...634..193S. doi:10.1086/496911. S2CID 54663701.
  18. ^ a b Genzel, R.; Weitzel, L.; Tacconi-Garman, L. E.; Blietz, M.; Cameron, M.; Krabbe, A.; Lutz, D.; Sternberg, A. (May 1995). "Infrared imaging and spectroscopy of NGC 7469". The Astrophysical Journal. 444: 129. Bibcode:1995ApJ...444..129G. doi:10.1086/175588.
  19. ^ Lonsdale, Carol J.; Lonsdale, Colin J.; Smith, Harding E.; Diamond, Philip J. (August 2003). "VLBI Imaging of Luminous Infrared Galaxies: Active Galactic Nucleus Cores in Markarian 231, UGC 5101, and NGC 7469". The Astrophysical Journal. 592 (2): 804–818. arXiv:astro-ph/0304335. Bibcode:2003ApJ...592..804L. doi:10.1086/375778. S2CID 14352535.
  20. ^ Soifer, B. T.; Bock, J. J.; Marsh, K.; Neugebauer, G.; Matthews, K.; Egami, E.; Armus, L. (July 2003). "High Spatial Resolution Mid-Infrared Observations of Three Seyfert Galaxies". The Astronomical Journal. 126 (1): 143–152. arXiv:astro-ph/0304105. Bibcode:2003AJ....126..143S. doi:10.1086/375647. S2CID 17643818.
  21. ^ Ulvestad, J. S.; Wilson, A. S.; Sramek, R. A. (July 1981). "Radio structures of Seyfert galaxies. II". The Astrophysical Journal. 247: 419. Bibcode:1981ApJ...247..419U. doi:10.1086/159051.
  22. ^ a b Diaz-Santos, T.; Alonso-Herrero, A.; Colina, L.; Ryder, S. D.; Knapen, J. H. (20 May 2007). "Resolving the Stellar Populations in the Circumnuclear Ring of NGC 7469". The Astrophysical Journal. 661 (1): 149–164. arXiv:astro-ph/0701557. Bibcode:2007ApJ...661..149D. doi:10.1086/513089. S2CID 15020835.
  23. ^ Fathi, Kambiz; Izumi, Takuma; Romeo, Alessandro B.; Martín, Sergio; Imanishi, Masatoshi; Hatziminaoglou, Evanthia; Aalto, Susanne; Espada, Daniel; Kohno, Kotaro; Krips, Melanie; Matsushita, Satoki; Meier, David S.; Nakai, Naomasa; Terashima, Yuichi (19 June 2015). "Local Instability Signatures in Alma Observations of Dense Gas in NGC 7469". The Astrophysical Journal. 806 (2): L34. arXiv:1506.01157. Bibcode:2015ApJ...806L..34F. doi:10.1088/2041-8205/806/2/L34. S2CID 2065071.
  24. ^ a b Pérez-Torres, M. A.; Alberdi, A.; Colina, L.; Torrelles, J. M.; Panagia, N.; Wilson, A.; Kankare, E.; Mattila, S. (1 November 2009). "Radio monitoring of NGC 7469: late-time radio evolution of SN 2000ft and the circumnuclear starburst in NGC 7469". Monthly Notices of the Royal Astronomical Society. 399 (3): 1641–1649. arXiv:0907.2644. Bibcode:2009MNRAS.399.1641P. doi:10.1111/j.1365-2966.2009.15389.x. S2CID 1037925.
  25. ^ a b Dopita, M. A.; Pereira, M.; Kewley, L. J.; Capaccioli, M. (November 2002). "Star Formation Rates in Interacting Starburst Galaxies". The Astrophysical Journal Supplement Series. 143 (1): 47–72. Bibcode:2002ApJS..143...47D. doi:10.1086/342624.
  26. ^ Transient Name Server entry for SN 2008ec. Retrieved 5 January 2023.
  27. ^ Alberdi, A.; Colina, L.; Torrelles, J. M.; Panagia, N.; Wilson, A. S.; Garrington, S. T. (20 February 2006). "Evolution of the Circumnuclear Radio Supernova SN 2000ft in NGC 7469". The Astrophysical Journal. 638 (2): 938–945. Bibcode:2006ApJ...638..938A. doi:10.1086/498859.
  28. ^ Colina, L.; Díaz-Santos, T.; Alonso-Herrero, A.; Panagia, N.; Alberdi, A.; Torrelles, J. M.; Wilson, A. S. (13 March 2007). "Optical detection of the radio supernova SN 2000ft in the circumnuclear region of the luminous infrared galaxy NGC 7469" (PDF). Astronomy & Astrophysics. 467 (2): 559–564. arXiv:astro-ph/0703481. Bibcode:2007A&A...467..559C. doi:10.1051/0004-6361:20067043. S2CID 16292785.
  29. ^ Greene, Jenny; Lim, Jeremy; Ho, Paul T. P. (July 2004). "Evidence for Interactions in HI Imaging of Seyfert Galaxies". The Astrophysical Journal Supplement Series. 153 (1): 93–117. Bibcode:2004ApJS..153...93G. doi:10.1086/383316.
  30. ^ Marquez, Isabel; Moles, Mariano (July 1994). "The isolated pair of spiral galaxies NGC 7469/IC 5283". The Astronomical Journal. 108: 90. Bibcode:1994AJ....108...90M. doi:10.1086/117048.
  31. ^ Smith, Denise A.; Herter, Terry; Haynes, Martha P.; Beichman, C. A.; Gautier, T. N. III (June 1996). "Starburst Galaxies. II Imaging and Spectroscopy of a Radio-selected Sample". The Astrophysical Journal Supplement Series. 104: 217. Bibcode:1996ApJS..104..217S. doi:10.1086/192299.
  32. ^ Chincarini, G.; Rood, H. J. (August 1976). "The Pegasus I and Pegasus II cluster of galaxies". Publications of the Astronomical Society of the Pacific. 88: 388. Bibcode:1976PASP...88..388C. doi:10.1086/129962.
  33. ^ Levy, Lorenza; Rose, James A.; van Gorkom, Jacqueline H.; Chaboyer, Brian (March 2007). "The Effect of Cluster Environment on Galaxy Evolution in the Pegasus I Cluster". The Astronomical Journal. 133 (3): 1104–1124. arXiv:astro-ph/0611591. Bibcode:2007AJ....133.1104L. doi:10.1086/510723. S2CID 17720310.
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Pahiatua railway station

Railway station in New Zealand PahiatuaNew Zealand Government Railways (NZGR)Regional railGeneral informationLocationPahiatua – Mangahao RoadTararuaNew ZealandCoordinates40°26′42.12″S 175°48′54.42″E / 40.4450333°S 175.8151167°E / -40.4450333; 175.8151167Elevation116 metres (381 ft)Owned byKiwiRailOperated byPahiatua Railcar Society (lessee)[1]Line(s)Wairarapa LineDistance154.62 kilometres (96.08 mi) from WellingtonPlatformsSingle sideTra...

 

Giovanna Mezzogiorno

Pour les articles homonymes, voir Mezzogiorno (homonymie). Giovanna Mezzogiorno Giovanna Mezzogiorno au Festival de Cannes 2010. Données clés Naissance 9 novembre 1974 (49 ans)Rome, Italie Nationalité Italienne Profession Actrice Films notables La Fenêtre d'en faceRendez-vous à PalermeVincere modifier Giovanna Mezzogiorno, née le 9 novembre 1974 à Rome, est une actrice italienne. Actrice multi-récompensée, elle est principalement connue pour ses rôles dans les films La Fenêtr...

The Hershey Company

Hershey's Syrup 1950s Hershey Company är tillverkare av chokladprodukter med huvudkontor i Hershey i Pennsylvania. Företaget hör till världens största tillverkare av [1] choklad. Företaget grundades 1894 av Milton S. Hershey som Hershey Chocolate Company och tillverkar utöver choklad även andra sorters konfektyrer. Bolaget har fabriker i bland annat Smiths Falls (i Ontario i Kanada) och Oakdale i Kalifornien. Varumärken Reese's Peanut Butter Cups Referenser ^ https://en.wikipedia.org...

 

Matthias Claudius

German poet and journalist (1740-1815) Asmus redirects here. For the Polish village, see Asmus, Poland. For other uses, see Asmus (disambiguation). Matthias ClaudiusBorn(1740-08-15)15 August 1740Reinfeld, Duchy of HolsteinDied21 January 1815(1815-01-21) (aged 74)Free and Hanseatic City of HamburgPen nameAsmusLanguageGermanNationalityGermanRelativesFriedrich Christoph Perthes (son-in-law)Carl Wigand Maximilian Jacobi (son-in-law) Matthias Claudius (15 August 1740 – 21 January 1815) was ...